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UndercoverN

Weird critter?

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UndercoverN

Hi everyone, I was looking in my rock collection and found this rock I've not really seen before and it appears to have some kind of animal in it. No idea on age or locality it was found in. It appears to have been tumbled or polished at some time

20190203_020626.jpg

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UndercoverN

20190203_020635.jpg

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Rockwood

The critter was a stalked echinoderm. Most likely a crinoid. It's a mold of one of the ossicles that made up it's stalk. 

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UndercoverN

Thanks here's another view

20190203_020641.jpg

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Tidgy's Dad

I agree with Tim, I think this is a chert nodule with an unusual fracture and/or erosional feature.

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Rockwood

I agree that the glass is half empty, but think it's half full too.

A calcite columnal would likely be in poor shape by the time it was buried in chert, and if it originally was fossilized as a section of stem and later reworked, the lumen mold would be the surface in the best condition. The circular shape centered in the missing top of the proposed dome looks like a hole which could represent the axis of the lumen to me. 

Either explanation requires a certain amount of chance.

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Fossildude19

Unfortunately, age and location are unknown.

So, ... maybe a crinoid or echinoid fragment, or geological feature. :shrug:

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Auspex

What an interesting feature; it would have stopped me in my tracks, too!

After viewing enlargements, and considering the known occurrence of fossils in flint, I have not cemented an opinion...
I lean toward it being a conchoidal spall, but look forward to more observations and thoughts by others.

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daves64

@UndercoverN Is the rock a normal weight for that size, or is it very light?

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ynot

It looks like a piece of chert with an hydrated "skin" (lighter parts).

The object that Y'all are talking about looks like an internal view. I agree with it being a echnoid part. It does not look like any type of fracture that I have seen in cryptocrystalline quartz.

I also see a bryozoan(?) in the hydrated area (below the unknown part).

 

The glare from the flash is making it hard to determine what is there. 

Can You please take pictures of that area under better lighting, so Your flash does not go off?

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UndercoverN

@daves64 it seems to be normal weight but I'm going home now and I will double check. @ynot I will take a few pics when I get back.

I believe this Rock came from washington state. Thanks everyone. 

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UndercoverN

20190204_015230.jpg

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UndercoverN

20190204_014902.jpg

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UndercoverN

I have one more I'm trying to post

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UndercoverN

@daves64

I think it may be slightly on the normal to little bit heavy side ...... 

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daves64

Just out of curiosity, does the white area in the last pic look similar to parts of this pic? You pic is a bit too fuzzy to tell. 

5c0ec31fc509d_Cloudy4.jpg.3d94059315537ccc984e7d88d2adda9f.jpg

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UndercoverN

No @daves64 it looks like the inside of a whopper candy. 

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Rockwood
32 minutes ago, UndercoverN said:

No @daves64 it looks like the inside of a whopper candy. 

Ah Ha !

The impression is the button from a pair of jeans stuck to the inside of the dryer. :D

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daves64
48 minutes ago, Rockwood said:

Ah Ha !

The impression is the button from a pair of jeans stuck to the inside of the dryer. :D

Of course! :doh!: Why didn't anyone else see that? :shrug:

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ynot
6 hours ago, UndercoverN said:

I have one more I'm trying to post

If the picture is under 4 meg You can try refreshing the page.

Thanks for the additional pictures.

Unfortunately they add little to what can be determined on this piece (at least by Me)

Still think there is more than just the "button impression" in the piece, but not sure what it is.

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